4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2013 by Delphix. All rights reserved.
25 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
26 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
27 * Copyright 2013 DEY Storage Systems, Inc.
30 /* Portions Copyright 2010 Robert Milkowski */
36 * This file describes the interface that the DMU provides for its
39 * The DMU also interacts with the SPA. That interface is described in
43 #include <sys/types.h>
44 #include <sys/param.h>
47 #include <sys/fs/zfs.h>
75 typedef struct objset objset_t;
76 typedef struct dmu_tx dmu_tx_t;
77 typedef struct dsl_dir dsl_dir_t;
79 typedef enum dmu_object_byteswap {
91 * Allocating a new byteswap type number makes the on-disk format
92 * incompatible with any other format that uses the same number.
94 * Data can usually be structured to work with one of the
95 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types.
98 } dmu_object_byteswap_t;
100 #define DMU_OT_NEWTYPE 0x80
101 #define DMU_OT_METADATA 0x40
102 #define DMU_OT_BYTESWAP_MASK 0x3f
105 * Defines a uint8_t object type. Object types specify if the data
106 * in the object is metadata (boolean) and how to byteswap the data
107 * (dmu_object_byteswap_t).
109 #define DMU_OT(byteswap, metadata) \
111 ((metadata) ? DMU_OT_METADATA : 0) | \
112 ((byteswap) & DMU_OT_BYTESWAP_MASK))
114 #define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \
115 ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \
116 (ot) < DMU_OT_NUMTYPES)
118 #define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \
119 ((ot) & DMU_OT_METADATA) : \
120 dmu_ot[(ot)].ot_metadata)
122 #define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \
123 ((ot) & DMU_OT_BYTESWAP_MASK) : \
124 dmu_ot[(ot)].ot_byteswap)
126 typedef enum dmu_object_type {
129 DMU_OT_OBJECT_DIRECTORY, /* ZAP */
130 DMU_OT_OBJECT_ARRAY, /* UINT64 */
131 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */
132 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */
133 DMU_OT_BPOBJ, /* UINT64 */
134 DMU_OT_BPOBJ_HDR, /* UINT64 */
136 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */
137 DMU_OT_SPACE_MAP, /* UINT64 */
139 DMU_OT_INTENT_LOG, /* UINT64 */
141 DMU_OT_DNODE, /* DNODE */
142 DMU_OT_OBJSET, /* OBJSET */
144 DMU_OT_DSL_DIR, /* UINT64 */
145 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */
146 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */
147 DMU_OT_DSL_PROPS, /* ZAP */
148 DMU_OT_DSL_DATASET, /* UINT64 */
150 DMU_OT_ZNODE, /* ZNODE */
151 DMU_OT_OLDACL, /* Old ACL */
152 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */
153 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */
154 DMU_OT_MASTER_NODE, /* ZAP */
155 DMU_OT_UNLINKED_SET, /* ZAP */
157 DMU_OT_ZVOL, /* UINT8 */
158 DMU_OT_ZVOL_PROP, /* ZAP */
159 /* other; for testing only! */
160 DMU_OT_PLAIN_OTHER, /* UINT8 */
161 DMU_OT_UINT64_OTHER, /* UINT64 */
162 DMU_OT_ZAP_OTHER, /* ZAP */
163 /* new object types: */
164 DMU_OT_ERROR_LOG, /* ZAP */
165 DMU_OT_SPA_HISTORY, /* UINT8 */
166 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */
167 DMU_OT_POOL_PROPS, /* ZAP */
168 DMU_OT_DSL_PERMS, /* ZAP */
169 DMU_OT_ACL, /* ACL */
170 DMU_OT_SYSACL, /* SYSACL */
171 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */
172 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */
173 DMU_OT_NEXT_CLONES, /* ZAP */
174 DMU_OT_SCAN_QUEUE, /* ZAP */
175 DMU_OT_USERGROUP_USED, /* ZAP */
176 DMU_OT_USERGROUP_QUOTA, /* ZAP */
177 DMU_OT_USERREFS, /* ZAP */
178 DMU_OT_DDT_ZAP, /* ZAP */
179 DMU_OT_DDT_STATS, /* ZAP */
180 DMU_OT_SA, /* System attr */
181 DMU_OT_SA_MASTER_NODE, /* ZAP */
182 DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */
183 DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */
184 DMU_OT_SCAN_XLATE, /* ZAP */
185 DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */
186 DMU_OT_DEADLIST, /* ZAP */
187 DMU_OT_DEADLIST_HDR, /* UINT64 */
188 DMU_OT_DSL_CLONES, /* ZAP */
189 DMU_OT_BPOBJ_SUBOBJ, /* UINT64 */
191 * Do not allocate new object types here. Doing so makes the on-disk
192 * format incompatible with any other format that uses the same object
195 * When creating an object which does not have one of the above types
196 * use the DMU_OTN_* type with the correct byteswap and metadata
199 * The DMU_OTN_* types do not have entries in the dmu_ot table,
200 * use the DMU_OT_IS_METDATA() and DMU_OT_BYTESWAP() macros instead
201 * of indexing into dmu_ot directly (this works for both DMU_OT_* types
202 * and DMU_OTN_* types).
207 * Names for valid types declared with DMU_OT().
209 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE),
210 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE),
211 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE),
212 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE),
213 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE),
214 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE),
215 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE),
216 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE),
217 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE),
218 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE),
221 typedef enum txg_how {
227 void byteswap_uint64_array(void *buf, size_t size);
228 void byteswap_uint32_array(void *buf, size_t size);
229 void byteswap_uint16_array(void *buf, size_t size);
230 void byteswap_uint8_array(void *buf, size_t size);
231 void zap_byteswap(void *buf, size_t size);
232 void zfs_oldacl_byteswap(void *buf, size_t size);
233 void zfs_acl_byteswap(void *buf, size_t size);
234 void zfs_znode_byteswap(void *buf, size_t size);
236 #define DS_FIND_SNAPSHOTS (1<<0)
237 #define DS_FIND_CHILDREN (1<<1)
240 * The maximum number of bytes that can be accessed as part of one
241 * operation, including metadata.
243 #define DMU_MAX_ACCESS (10<<20) /* 10MB */
244 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
246 #define DMU_USERUSED_OBJECT (-1ULL)
247 #define DMU_GROUPUSED_OBJECT (-2ULL)
248 #define DMU_DEADLIST_OBJECT (-3ULL)
251 * artificial blkids for bonus buffer and spill blocks
253 #define DMU_BONUS_BLKID (-1ULL)
254 #define DMU_SPILL_BLKID (-2ULL)
256 * Public routines to create, destroy, open, and close objsets.
258 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
259 int dmu_objset_own(const char *name, dmu_objset_type_t type,
260 boolean_t readonly, void *tag, objset_t **osp);
261 void dmu_objset_rele(objset_t *os, void *tag);
262 void dmu_objset_disown(objset_t *os, void *tag);
263 int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp);
265 void dmu_objset_evict_dbufs(objset_t *os);
266 int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
267 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
268 int dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
269 struct nvlist *snaps);
270 int dmu_objset_clone(const char *name, const char *origin);
271 int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer,
272 struct nvlist *errlist);
273 int dmu_objset_snapshot_one(const char *fsname, const char *snapname);
274 int dmu_objset_snapshot_tmp(const char *, const char *, int);
275 int dmu_objset_find(char *name, int func(const char *, void *), void *arg,
277 void dmu_objset_byteswap(void *buf, size_t size);
278 int dsl_dataset_rename_snapshot(const char *fsname,
279 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
281 typedef struct dmu_buf {
282 uint64_t db_object; /* object that this buffer is part of */
283 uint64_t db_offset; /* byte offset in this object */
284 uint64_t db_size; /* size of buffer in bytes */
285 void *db_data; /* data in buffer */
288 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr);
291 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
293 #define DMU_POOL_DIRECTORY_OBJECT 1
294 #define DMU_POOL_CONFIG "config"
295 #define DMU_POOL_FEATURES_FOR_WRITE "features_for_write"
296 #define DMU_POOL_FEATURES_FOR_READ "features_for_read"
297 #define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions"
298 #define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg"
299 #define DMU_POOL_ROOT_DATASET "root_dataset"
300 #define DMU_POOL_SYNC_BPOBJ "sync_bplist"
301 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
302 #define DMU_POOL_ERRLOG_LAST "errlog_last"
303 #define DMU_POOL_SPARES "spares"
304 #define DMU_POOL_DEFLATE "deflate"
305 #define DMU_POOL_HISTORY "history"
306 #define DMU_POOL_PROPS "pool_props"
307 #define DMU_POOL_L2CACHE "l2cache"
308 #define DMU_POOL_TMP_USERREFS "tmp_userrefs"
309 #define DMU_POOL_DDT "DDT-%s-%s-%s"
310 #define DMU_POOL_DDT_STATS "DDT-statistics"
311 #define DMU_POOL_CREATION_VERSION "creation_version"
312 #define DMU_POOL_SCAN "scan"
313 #define DMU_POOL_FREE_BPOBJ "free_bpobj"
314 #define DMU_POOL_BPTREE_OBJ "bptree_obj"
315 #define DMU_POOL_EMPTY_BPOBJ "empty_bpobj"
318 * Allocate an object from this objset. The range of object numbers
319 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
321 * The transaction must be assigned to a txg. The newly allocated
322 * object will be "held" in the transaction (ie. you can modify the
323 * newly allocated object in this transaction).
325 * dmu_object_alloc() chooses an object and returns it in *objectp.
327 * dmu_object_claim() allocates a specific object number. If that
328 * number is already allocated, it fails and returns EEXIST.
330 * Return 0 on success, or ENOSPC or EEXIST as specified above.
332 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot,
333 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
334 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
335 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
336 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
337 int blocksize, dmu_object_type_t bonustype, int bonuslen);
340 * Free an object from this objset.
342 * The object's data will be freed as well (ie. you don't need to call
343 * dmu_free(object, 0, -1, tx)).
345 * The object need not be held in the transaction.
347 * If there are any holds on this object's buffers (via dmu_buf_hold()),
348 * or tx holds on the object (via dmu_tx_hold_object()), you can not
349 * free it; it fails and returns EBUSY.
351 * If the object is not allocated, it fails and returns ENOENT.
353 * Return 0 on success, or EBUSY or ENOENT as specified above.
355 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx);
358 * Find the next allocated or free object.
360 * The objectp parameter is in-out. It will be updated to be the next
361 * object which is allocated. Ignore objects which have not been
362 * modified since txg.
364 * XXX Can only be called on a objset with no dirty data.
366 * Returns 0 on success, or ENOENT if there are no more objects.
368 int dmu_object_next(objset_t *os, uint64_t *objectp,
369 boolean_t hole, uint64_t txg);
372 * Set the data blocksize for an object.
374 * The object cannot have any blocks allcated beyond the first. If
375 * the first block is allocated already, the new size must be greater
376 * than the current block size. If these conditions are not met,
377 * ENOTSUP will be returned.
379 * Returns 0 on success, or EBUSY if there are any holds on the object
380 * contents, or ENOTSUP as described above.
382 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size,
383 int ibs, dmu_tx_t *tx);
386 * Set the checksum property on a dnode. The new checksum algorithm will
387 * apply to all newly written blocks; existing blocks will not be affected.
389 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
393 * Set the compress property on a dnode. The new compression algorithm will
394 * apply to all newly written blocks; existing blocks will not be affected.
396 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
400 * Decide how to write a block: checksum, compression, number of copies, etc.
402 #define WP_NOFILL 0x1
403 #define WP_DMU_SYNC 0x2
406 void dmu_write_policy(objset_t *os, struct dnode *dn, int level, int wp,
407 struct zio_prop *zp);
409 * The bonus data is accessed more or less like a regular buffer.
410 * You must dmu_bonus_hold() to get the buffer, which will give you a
411 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
412 * data. As with any normal buffer, you must call dmu_buf_read() to
413 * read db_data, dmu_buf_will_dirty() before modifying it, and the
414 * object must be held in an assigned transaction before calling
415 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
416 * buffer as well. You must release your hold with dmu_buf_rele().
418 * Returns ENOENT, EIO, or 0.
420 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **);
421 int dmu_bonus_max(void);
422 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
423 int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *);
424 dmu_object_type_t dmu_get_bonustype(dmu_buf_t *);
425 int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *);
428 * Special spill buffer support used by "SA" framework
431 int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
432 int dmu_spill_hold_by_dnode(struct dnode *dn, uint32_t flags,
433 void *tag, dmu_buf_t **dbp);
434 int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
437 * Obtain the DMU buffer from the specified object which contains the
438 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so
439 * that it will remain in memory. You must release the hold with
440 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your
441 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU.
443 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill
444 * on the returned buffer before reading or writing the buffer's
445 * db_data. The comments for those routines describe what particular
446 * operations are valid after calling them.
448 * The object number must be a valid, allocated object number.
450 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
451 void *tag, dmu_buf_t **, int flags);
452 void dmu_buf_add_ref(dmu_buf_t *db, void* tag);
453 void dmu_buf_rele(dmu_buf_t *db, void *tag);
454 uint64_t dmu_buf_refcount(dmu_buf_t *db);
457 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a
458 * range of an object. A pointer to an array of dmu_buf_t*'s is
459 * returned (in *dbpp).
461 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and
462 * frees the array. The hold on the array of buffers MUST be released
463 * with dmu_buf_rele_array. You can NOT release the hold on each buffer
464 * individually with dmu_buf_rele.
466 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset,
467 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp);
468 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag);
471 * Returns NULL on success, or the existing user ptr if it's already
474 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user().
476 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which
477 * will be set to db->db_data when you are allowed to access it. Note
478 * that db->db_data (the pointer) can change when you do dmu_buf_read(),
479 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill().
480 * *user_data_ptr_ptr will be set to the new value when it changes.
482 * If non-NULL, pageout func will be called when this buffer is being
483 * excised from the cache, so that you can clean up the data structure
484 * pointed to by user_ptr.
486 * dmu_evict_user() will call the pageout func for all buffers in a
487 * objset with a given pageout func.
489 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr,
490 dmu_buf_evict_func_t *pageout_func);
492 * set_user_ie is the same as set_user, but request immediate eviction
493 * when hold count goes to zero.
495 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr,
496 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func);
497 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr,
498 void *user_ptr, void *user_data_ptr_ptr,
499 dmu_buf_evict_func_t *pageout_func);
500 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func);
503 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set.
505 void *dmu_buf_get_user(dmu_buf_t *db);
508 * Returns the blkptr associated with this dbuf, or NULL if not set.
510 struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db);
513 * Indicate that you are going to modify the buffer's data (db_data).
515 * The transaction (tx) must be assigned to a txg (ie. you've called
516 * dmu_tx_assign()). The buffer's object must be held in the tx
517 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
519 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx);
522 * Tells if the given dbuf is freeable.
524 boolean_t dmu_buf_freeable(dmu_buf_t *);
527 * You must create a transaction, then hold the objects which you will
528 * (or might) modify as part of this transaction. Then you must assign
529 * the transaction to a transaction group. Once the transaction has
530 * been assigned, you can modify buffers which belong to held objects as
531 * part of this transaction. You can't modify buffers before the
532 * transaction has been assigned; you can't modify buffers which don't
533 * belong to objects which this transaction holds; you can't hold
534 * objects once the transaction has been assigned. You may hold an
535 * object which you are going to free (with dmu_object_free()), but you
538 * You can abort the transaction before it has been assigned.
540 * Note that you may hold buffers (with dmu_buf_hold) at any time,
541 * regardless of transaction state.
544 #define DMU_NEW_OBJECT (-1ULL)
545 #define DMU_OBJECT_END (-1ULL)
547 dmu_tx_t *dmu_tx_create(objset_t *os);
548 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
549 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
551 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name);
552 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object);
553 void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
554 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
555 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
556 void dmu_tx_abort(dmu_tx_t *tx);
557 int dmu_tx_assign(dmu_tx_t *tx, enum txg_how txg_how);
558 void dmu_tx_wait(dmu_tx_t *tx);
559 void dmu_tx_commit(dmu_tx_t *tx);
562 * To register a commit callback, dmu_tx_callback_register() must be called.
564 * dcb_data is a pointer to caller private data that is passed on as a
565 * callback parameter. The caller is responsible for properly allocating and
568 * When registering a callback, the transaction must be already created, but
569 * it cannot be committed or aborted. It can be assigned to a txg or not.
571 * The callback will be called after the transaction has been safely written
572 * to stable storage and will also be called if the dmu_tx is aborted.
573 * If there is any error which prevents the transaction from being committed to
574 * disk, the callback will be called with a value of error != 0.
576 typedef void dmu_tx_callback_func_t(void *dcb_data, int error);
578 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
582 * Free up the data blocks for a defined range of a file. If size is
583 * -1, the range from offset to end-of-file is freed.
585 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
586 uint64_t size, dmu_tx_t *tx);
587 int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset,
589 int dmu_free_long_object(objset_t *os, uint64_t object);
592 * Convenience functions.
594 * Canfail routines will return 0 on success, or an errno if there is a
595 * nonrecoverable I/O error.
597 #define DMU_READ_PREFETCH 0 /* prefetch */
598 #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */
599 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
600 void *buf, uint32_t flags);
601 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
602 const void *buf, dmu_tx_t *tx);
603 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
605 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size);
606 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
608 int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size,
612 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
613 uint64_t size, struct page *pp, dmu_tx_t *tx);
615 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
616 uint64_t size, struct vm_page **ppa, dmu_tx_t *tx);
619 struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size);
620 void dmu_return_arcbuf(struct arc_buf *buf);
621 void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf,
623 int dmu_xuio_init(struct xuio *uio, int niov);
624 void dmu_xuio_fini(struct xuio *uio);
625 int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off,
627 int dmu_xuio_cnt(struct xuio *uio);
628 struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i);
629 void dmu_xuio_clear(struct xuio *uio, int i);
630 void xuio_stat_wbuf_copied();
631 void xuio_stat_wbuf_nocopy();
633 extern int zfs_prefetch_disable;
636 * Asynchronously try to read in the data.
638 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset,
641 typedef struct dmu_object_info {
642 /* All sizes are in bytes unless otherwise indicated. */
643 uint32_t doi_data_block_size;
644 uint32_t doi_metadata_block_size;
645 dmu_object_type_t doi_type;
646 dmu_object_type_t doi_bonus_type;
647 uint64_t doi_bonus_size;
648 uint8_t doi_indirection; /* 2 = dnode->indirect->data */
649 uint8_t doi_checksum;
650 uint8_t doi_compress;
652 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */
653 uint64_t doi_max_offset;
654 uint64_t doi_fill_count; /* number of non-empty blocks */
657 typedef void arc_byteswap_func_t(void *buf, size_t size);
659 typedef struct dmu_object_type_info {
660 dmu_object_byteswap_t ot_byteswap;
661 boolean_t ot_metadata;
663 } dmu_object_type_info_t;
665 typedef struct dmu_object_byteswap_info {
666 arc_byteswap_func_t *ob_func;
668 } dmu_object_byteswap_info_t;
670 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES];
671 extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS];
674 * Get information on a DMU object.
676 * Return 0 on success or ENOENT if object is not allocated.
678 * If doi is NULL, just indicates whether the object exists.
680 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi);
681 /* Like dmu_object_info, but faster if you have a held dnode in hand. */
682 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi);
683 /* Like dmu_object_info, but faster if you have a held dbuf in hand. */
684 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi);
686 * Like dmu_object_info_from_db, but faster still when you only care about
687 * the size. This is specifically optimized for zfs_getattr().
689 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize,
690 u_longlong_t *nblk512);
692 typedef struct dmu_objset_stats {
693 uint64_t dds_num_clones; /* number of clones of this */
694 uint64_t dds_creation_txg;
696 dmu_objset_type_t dds_type;
697 uint8_t dds_is_snapshot;
698 uint8_t dds_inconsistent;
699 char dds_origin[MAXNAMELEN];
700 } dmu_objset_stats_t;
703 * Get stats on a dataset.
705 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
708 * Add entries to the nvlist for all the objset's properties. See
709 * zfs_prop_table[] and zfs(1m) for details on the properties.
711 void dmu_objset_stats(objset_t *os, struct nvlist *nv);
714 * Get the space usage statistics for statvfs().
716 * refdbytes is the amount of space "referenced" by this objset.
717 * availbytes is the amount of space available to this objset, taking
718 * into account quotas & reservations, assuming that no other objsets
719 * use the space first. These values correspond to the 'referenced' and
720 * 'available' properties, described in the zfs(1m) manpage.
722 * usedobjs and availobjs are the number of objects currently allocated,
725 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
726 uint64_t *usedobjsp, uint64_t *availobjsp);
729 * The fsid_guid is a 56-bit ID that can change to avoid collisions.
730 * (Contrast with the ds_guid which is a 64-bit ID that will never
731 * change, so there is a small probability that it will collide.)
733 uint64_t dmu_objset_fsid_guid(objset_t *os);
736 * Get the [cm]time for an objset's snapshot dir
738 timestruc_t dmu_objset_snap_cmtime(objset_t *os);
740 int dmu_objset_is_snapshot(objset_t *os);
742 extern struct spa *dmu_objset_spa(objset_t *os);
743 extern struct zilog *dmu_objset_zil(objset_t *os);
744 extern struct dsl_pool *dmu_objset_pool(objset_t *os);
745 extern struct dsl_dataset *dmu_objset_ds(objset_t *os);
746 extern void dmu_objset_name(objset_t *os, char *buf);
747 extern dmu_objset_type_t dmu_objset_type(objset_t *os);
748 extern uint64_t dmu_objset_id(objset_t *os);
749 extern uint64_t dmu_objset_syncprop(objset_t *os);
750 extern uint64_t dmu_objset_logbias(objset_t *os);
751 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
752 uint64_t *id, uint64_t *offp, boolean_t *case_conflict);
753 extern int dmu_snapshot_realname(objset_t *os, char *name, char *real,
754 int maxlen, boolean_t *conflict);
755 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name,
756 uint64_t *idp, uint64_t *offp);
758 typedef int objset_used_cb_t(dmu_object_type_t bonustype,
759 void *bonus, uint64_t *userp, uint64_t *groupp);
760 extern void dmu_objset_register_type(dmu_objset_type_t ost,
761 objset_used_cb_t *cb);
762 extern void dmu_objset_set_user(objset_t *os, void *user_ptr);
763 extern void *dmu_objset_get_user(objset_t *os);
766 * Return the txg number for the given assigned transaction.
768 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
772 * If a parent zio is provided this function initiates a write on the
773 * provided buffer as a child of the parent zio.
774 * In the absence of a parent zio, the write is completed synchronously.
775 * At write completion, blk is filled with the bp of the written block.
776 * Note that while the data covered by this function will be on stable
777 * storage when the write completes this new data does not become a
778 * permanent part of the file until the associated transaction commits.
782 * {zfs,zvol,ztest}_get_done() args
785 struct zilog *zgd_zilog;
786 struct blkptr *zgd_bp;
792 typedef void dmu_sync_cb_t(zgd_t *arg, int error);
793 int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd);
796 * Find the next hole or data block in file starting at *off
797 * Return found offset in *off. Return ESRCH for end of file.
799 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole,
803 * Initial setup and final teardown.
805 extern void dmu_init(void);
806 extern void dmu_fini(void);
808 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp,
809 uint64_t object, uint64_t offset, int len);
810 void dmu_traverse_objset(objset_t *os, uint64_t txg_start,
811 dmu_traverse_cb_t cb, void *arg);
812 int dmu_diff(const char *tosnap_name, const char *fromsnap_name,
813 struct file *fp, offset_t *offp);
816 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
817 extern uint64_t zfs_crc64_table[256];
819 extern int zfs_mdcomp_disable;
825 #endif /* _SYS_DMU_H */